Splinter

The film opens on a sleepy gas station, where the slack-jawed pump attendant (Charles Baker) is attacked by a seemingly rabid animal. Through a series of glimpses the attendant’s body begin to contort after the attack. Meanwhile, a young couple, Seth Belzer (Paulo Costanzo) and Polly Watt (Jill Wagner) retreat to the wilderness for a romantic camping trip in the ancient forests of Oklahoma, but their plans are shattered when they are car-jacked by an escaped convict, Dennis Farell (Shea Whigham), and his drug-addict girlfriend, Lacey Belisle (Rachel Kerbs). As the foursome travel the back roads together, they get a flat tire when they run over a small splinter-infected animal on the road. Finding shelter at the now abandoned gas station, they fend off larger incarnations of a parasite as it infects more victims. —Wikipedia